JPS633757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor printing method using pads, and its purpose is to print on the surfaces of curved objects made of various materials such as wood, metal, ceramics, glass, and plastic. To easily print multicolor designs using pads.

Conventionally, printing methods using pads are suitable for printing on the surface of a target substrate even if it is somewhat distorted, and are therefore widely used as a method for printing on the surface of a curved object. However, since general pad printing is configured to mainly print single-color designs, it is necessary to use a special method if you want to print designs in two or more colors. Such methods include (1) a method of using multiple plates or pads for painting (see, for example, Japanese Patent Publication No. 12450/1983); that is, creating several plates for each color that makes up the design, and applying individual markings to each plate; A method of sequentially applying various colors to a base material using a painting pad to form the original design, and (2) using a transfer material to transfer the design of the transfer material to the surface of a heat-resistant base material using the pad. Method (Refer to Japanese Patent Publication No. 53-43331) In other words, a transfer material provided with two types of adhesive layers having different adhesion forces at two different temperatures on the upper and lower sides of the pattern is brought into pressure contact with the pad at a first temperature. There is a method of applying the design to the base material by transferring the design of the transfer material to the pad and then bringing the pad into pressure contact with the surface of the heat-resistant base material in a second temperature state.

However, each of the above methods has the following drawbacks. In other words, in (1), it is necessary to stamp the pad multiple times to apply one design,
As a result, since the pad is an elastic material, it is impossible to accurately register the design, so it is impossible to create a detailed multicolored design. In (2), it is necessary to heat the base material to a high temperature in the process, so it can only be printed on heat-resistant base materials such as ceramics, and it is impossible to apply it to non-heat-resistant base materials.

In view of the drawbacks of the conventional methods as described above, the present inventors
As a result of various considerations, we have completed a multicolor printing method using pads that allows detailed multicolor designs to be easily applied not only to heat-resistant substrates but also to non-heat-resistant substrates. It is something.

That is, the present invention provides (a) a transfer material in which a wax layer 2 is formed on a base sheet 1 and a pattern 3 made of heat-sensitive adhesive ink is formed on the wax layer 2, and the wax layer 2 is softened and the heat-sensitive adhesive (b) The transfer material preheated in step (a) and the painting pad 4 are brought into pressure contact with each other, so that the pattern 3 of the transfer material is transferred to the surface of the painting pad. (c) Preheating the surface of the substrate to a temperature at which the heat-sensitive adhesive ink exhibits adhesive properties by pressing the necessary portion of the surface of the substrate to be painted and the heating pad 5 against each other; (d) painting the surface of the base material by pressing the painting pad 4 onto which the design 3 has been transferred in the step (b) and the surface of the base material preheated in the step (c) above against each other; This is a multicolor printing method using pads that consists of several steps.

The printing method of the present invention will be explained in more detail below. In the present invention, heat-resistant substrates such as ceramics, enamel, glass, and alumite, and non-heat-resistant substrates such as plastic are objects of printing.

The printing method of the present invention consists of four steps. The first step is a step of preheating the transfer material.
The transfer material used is one in which a wax layer is formed on a base sheet, and a pattern made of heat-sensitive adhesive ink is formed on the wax layer. The base sheet of the transfer material may be paper such as high-quality paper or coated paper, or film such as polyethylene terephthalate, which is used in ordinary heat transfer materials. The wax layer is formed by applying wax onto the base sheet. The waxes used include, for example, modified montan wax, paraffin wax, microcrystalline wax, or mixtures thereof, which soften at temperatures of 80° C. or higher. Wax that softens at 80° C. or lower is not preferred because the heat required for drying the pattern on the transfer material when printing it may cause the pattern to collapse. Further, the pattern layer is formed using heat-sensitive adhesive ink by methods such as gravure, screen printing, and offset printing. The ink used is the wax layer 2.
It must exhibit adhesive properties at temperatures at which it softens. For example, 50 to 100
Polyamide-based, neoprene-based, which exhibits adhesive properties at °C.
Acrylic adhesives can be used. The transfer material is preheated at a temperature at which the wax layer 2 is softened and the heat-sensitive adhesive ink exhibits adhesive properties.

The second step is a step in which the transfer material preheated in the first step and the painting pad 4 are brought into pressure contact with each other, and the design 3 of the transfer material is transferred to the surface of the painting pad (Fig. 1, (See Figure 2). Since the pattern 3 of the transfer material is preheated in the first step, it exhibits adhesive properties and the wax layer 2 is softened and is in a state where it is easily peeled off, so that the pattern 3 is transferred to the surface of the painting pad after pressure contact.

The third step is a step of preheating the surface of the substrate to a temperature at which the heat-sensitive adhesive ink exhibits adhesive properties by bringing the heating pad 5 into pressure contact with a necessary portion of the surface of the substrate to be printed. (See Figure 3). The heating pad 5 is heated in advance. This heating may be done from the outside, or a heater may be provided inside the heating pad 5 for heating. By bringing the thus heated heating pad 5 into pressure contact with the surface of the base material, the surface of the base material is heated. At this time, the surface temperature of the heating pad 5 must be set so that the temperature of the substrate surface is as follows. That is, in the fourth step after the substrate surface is heated, it is necessary to set the temperature to such a level that the heat-sensitive adhesive ink exhibits adhesive properties.

The fourth step is the step of applying a decoration to the surface of the base material by bringing the painting pad onto which the design has been transferred into pressure contact with the preheated surface of the base material (see FIG. 4). In this step, the surface of the base material is preheated to a temperature at which the pattern exhibits adhesive properties, so that it is brought into pressure contact with the painting pad, thereby adhering the pattern and painting.

Since the present invention is a multicolor printing method using the pads as described above, it is possible to form a detailed pattern on the surface of a curved object, and the following effects can also be obtained. First, since the surface of the substrate is heated using a heating pad, non-heat resistant substrates can also be targeted. In other words, in the conventional pad printing method using transfer paper, the base material must be kept at about 80°C during painting, which causes the base material to soften when molded from polyethylene, vinyl chloride, etc., making it difficult to print. The target was limited to heat-resistant base materials. On the other hand, in the present invention, since the heating pad is used to preheat only the necessary areas, the above-mentioned problem does not occur, and therefore printing can be performed even on non-heat resistant substrates. Furthermore, since the surface of the base material can be preheated only to the necessary portions, thermal efficiency is good, and the simple process is suitable for mass production.

Examples of the present invention will be described below.

Example 1 A wax layer having the composition shown below was uniformly coated on coated paper.

Hoechst OP (manufactured by Hechs) 80 parts Bareco Ultraflex Umber (manufactured by Bareco) 20 parts A pattern was formed on the formed wax layer using a polyamide heat-sensitive adhesive ink having the composition shown below.

Persamide 940 (manufactured by Daiichi General) 40 parts Persamide 100 (manufactured by Daiichi General) 10 parts Pigment 100 parts Duomin TDO (manufactured by Lion Akzo) 1 part Toluene 100 parts Isopropyl alcohol 100 parts Formed as above After preheating the transfer material at 100° C., the painting pad was brought into pressure contact with the design of the transfer material, and the design was transferred to the surface of the painting pad.

On the other hand, use a heating pad to heat the required area of the ceramic surface.
After preheating to 110°C, within a few minutes, the painting pad to which the design had been transferred was brought into pressure contact with the preheated ceramic surface, and as a result, a clear design could be printed on the ceramic.

Example 2 A wax layer having the composition shown below was uniformly coated on a polyethylene terephthalate film.

Hoechst OP (manufactured by Hoechst) 60 parts Nippon Wax 155 (manufactured by Nippon Seiro Co., Ltd.) 25 parts Hoechst PA190 (manufactured by Hoechst) 15 parts Copolymerized nylon heat-sensitive adhesive ink with the following composition on the formed wax layer The pattern was formed using

Platamide H105 (manufactured by Nippon Rilsan Co., Ltd.) 30 parts Trichlorethylene 50 parts Pigment 100 parts Isopropyl alcohol 150 parts Duomin TDO (manufactured by Lion Akzo Co., Ltd.) 1 part In the same manner as in Example 1, the design was transferred to the surface of the painting pad.

On the other hand, after preheating the necessary part of the surface of the polyethylene molded container to about 80°C with a heating pad, the painting pad, on which the design was quickly transferred, was brought into pressure contact with the preheated surface of the container. It was possible to print clear designs on the paper without causing any damage due to heating.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 each show an enlarged sectional view of the printing process in the present invention. In the figure, 1...base sheet, 2...wax layer, 3...
Design, 4... Pad for painting, 5... Pad for heating, 6
…Base material.

Claims (1)

[Scope of Claims] 1 (a) A transfer material in which a wax layer 2 is formed on a base sheet 1 and a pattern 3 made of heat-sensitive adhesive ink is formed on the wax layer 2 is softened and Step (b) of preheating the heat-sensitive adhesive ink to a temperature at which it exhibits adhesive properties; By pressing the transfer material preheated in step (a) and the painting pad 4 against each other, the pattern 3 on the transfer material is transferred to the painting pad 4. Step (c) of transferring to the surface: By pressing the necessary part of the surface of the substrate to be painted and the heating pad 5 against each other, the surface of the substrate is preheated to a temperature at which the heat-sensitive adhesive ink exhibits adhesive properties. (d) A step of painting the surface of the base material by pressing the painting pad 4 onto which the design 3 has been transferred in the step (b) and the surface of the base material preheated in the step (c) above against each other. A multicolor printing method using pads.